hi,
to fix this you only have to modify this file
"application/views/task/task_list.php", at lines 21 and 23 replace "getDueDate()" for "getStartDate()"
it should look like this
#21 <div class="startDate"><b><?php echo lang('start date') ?>: </b><?php echo format_date($task_list->getStartDate(), null, 0) ?></div>
#22 <?php } else { ?>
#23 <div class="startDate"><b><?php echo lang('start date') ?>: </b><?php echo format_descriptive_date($task_list->getStartDate(), 0) ?></div>